Electromagnetic clutch.



Patented Mar. 9, i909.

` i SHEETS-SHEET H. AST.

ELECTROMAGNETIG CLUTCH. APPLICATION FILM) JUNE 15, 1906.

Patented. Mar. 9, 1909'.

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ELEGTROMAGNBTIG GLUTGH.

, l APPLICATION FILED JUNE 15, 1906. 4 914,375, Patented Mar. 9, 1909.,-

3 SHEETS-SHEET 3.

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HEINRlCH AST, OF VIENNA, AUSTRlA-HUXGRY. ASSIGXOH TO THE 'FIRM Ol*VL'LliiX MASCHINEXFABRIKSACTIEX-GESELLSCHAFT, OF VIENNA, ASTRlAfHUNGARY.

ELE C-TROMAGNETIC CLUTCH.

Specification of Letters Patent.

Patented March 9, lOQ.

Application led June 15, 1906. Serial No. 321,866`

To all whom it may concern:

Be it known that I. Heumen Asr, subject of the Emperor ofAustria-Hungary, residing at Vienna, AustriasHungary, have inventedcertain new and useful Improvements in Electromagnetic Clutches, ofwhich the following is a specification.

In electro-magnetic clutches breakdowns and damage arc frequently causedby the lu` bricating medium from the lubricated parts of the clutchgetting between the magnetictlly attracnrl parte of the clutch andbetween the friction ,surfaces of the clutch to the winding of thehtio-magnet or to the contact rings. so tl t the frictional resistancenecessary for the iransini Y'ion ot power is materially reduced. Tt.results in the parts slipping' and being irregular in their action, orin the winding and its insulation being damaged, and where lubricatinginediuiu is present. on the contact rings the resistance to the electriccurrent which effects the excitation of the magnetic parts of the clutchis altered.

The present invention has for its obje t to provide a device on clutchesof this kind for obviating the said disadvantages and which device isbroadly such that `the lubricating agent is thrown by centrifugal forcefrom the lubricated parts into chambers which are outI of the reach ofthe parte to be protected and which chambers are provided with guidingsurfaces for altering the direction of flow of the lubricating mediumthrown from the lubricated 'parts and whereby such lubricating medium iscarried off by centrifugal force.

Devices for effecting this purpose may be variously constructed; the'accompanying illustrative drawings show some constructional examples.

`In all the figures of suoli drawings the two parts of the cl-utch whichattract each other are marked a and Z2, the frictional surfaces c and Zthe vwindingeand the contact rings j'.

In Figure 1 there is connected to the part 7) of theclutch a gear wheelg, or it might be a belt pulley, rope pulley or the like, which ismounted upon the running bush /z and which runs loose upon the shaft z'with the clutch part o when this part is throvn out of operation,` whilethe part a of the clutch is keyed upon such shaft. Thenecessarylubrication is therefore between the shaft i and the bush 7L and, onaccount of the attracted surfaces of the clutch parts a and b and beyondthe. planesl of the friction sur- `faces, and the bush, as well as thehub portion of the gear wheel g, are-provided at this partwith outwardlyinclined lubricant guiding surfaces 1 and 2. .ln this way thelubricating medium is thrown through a nozzle-like annular groove orgrooves against a conical face of the parta of the clutch and into achamber located in a plane at. one side of those of the attractedsurfaces and the friction surfaces, contact of the lubricating mediumwith the friction surfaces c, (l and the winding e being therebyrendered impossible. Lubricating medium emerging from the other end ofthe running bush )i is centrifugally thrown out along` the surfaces 3:ind of the lubricant guide rings m and u which are at one side of thecontact rings f, the outer periphery of such guide rings -be ing formedwith grooves, hereinafter called :purting grooves, adapted to check thefiow or creep of lubricant and cause it to be thrown ofi' so that thecontact rings and their insulation are kept perfectly dry. By means ofpacking [u between the whe-el hub and the lubricant guiding ring n whichas beforesaid is formed with lubricant spurting groovesl passage of thelubricant medium into the interior of the insulation of the contactrings is prevented.

Figs. 2 and 3 illustrate other shapes of the inner end of the runningbush z and its lu-v bricant deiiecting surface 1..'

As shown in Fig. l the chamber into which is led lubricating medium,thrown out from the inner end of the running bush L and from the hub ofthe part b of the clutch, may be arranged in the'part b of the clutch bysuitably shortening these parts-while still being situated in aplane atone side of .those of the attracting surfaces and the friction bodies.The deiiecting surface is accordingly arranged to extend in an opposited irection to that of the arrangement shown 1n Figs. 1 to 3. Thelubricating material which collects in this chamber can pass to theout-'f 'slde by passages l in the part b of the clutch.

It is also advisable to form the hub of the part a of the clutch withspurting grooves for collecting the lubricating medium falling down fromthe inclined surface of the collecting chamber against which it is-centrifugally thrown.

In the constructions illustrated in Figs. 5 and 6, the part b of theclutch runs loosely without a bush upon the shaft z'. In leach of thesetwo constructions the. inner end of the hub is extended beyond theplanes of the two attracting surfaces, a guiding or de' fleeting surfacee of an intermediate ring o being inclined outwardly or inwardly to ,oneside or the `other according to the position of' the chamber ignto whichthe lubricating medium is discharged. The hub of the part b of theclutch, or of the part g of the machine, contains springs p which actupon the intermediate ring 0, and the other hub which is juxtaposed tothe ring 0 having a lubricant guiding or deflecti-ng surface 5, has

spurting 'grooves formed in its outer periphv ery.l Passages 1 (Fig. 6)may be provided for carrying away the lubricating medium from thereceiving chamber. The contact rings f and their' insulation y' areyprotected from the lubricating medium thrown centrifugallyv off from thelubricant guiding surface 4C in` consequence of the lateral arrangementof such surfaces.A In the clutch shown in Fig. 7 that end of the hub ofthe part b of the clutch which is formed with spurting grooves projectsinto a chamber in the part a of the clutch arranged l in a plane at oneside of the planes of the attracting surfaces, passages 1 being providedto carry of 4the lubricating medium to the outside from such chamber.The Contact rings f, which are connected to but insulated from the partb of the clutch, are protected by the outwardly' turned lubri-v cantguiding vor deflecting surface 4 and by a suitably shaped annularlflange 6,

. In the construction shown in Figs. 8 and 9, the chamber into which iscentrifugally thrown the lubricating medium emerging from between theshaft z' and running bush L- and from between the shaft z' and hub of'the clutch part b, is vformed by a channel- ,shaped fiange g on therunning bush and on thev hub' of the part 'Z1 of the clutch, respectively. This flange extends over the spurtin'g grooves in the. hub ofthepart a ofthe clutch, and the lubricating medium, which by thesemeans iskept off the attracting sur- 4 faces of the clutch, and is carried ott'to the outside by laterally directed passages 1. The contact rings fmay, in such 'a case, as shown in Fig. S, be arranged quite out of thereach of the thrown off lubricating medium.

Fig. 10 shows a construction, in which the chamber into which thelubricating medium is thrown andthereby kept away from the attractingsurfaces, the friction surfaces and the windin is' formed by a ring frwhich surrounds t e part where the two hubs meet and so protects theattracting surfaces of the 'parts a and b of the clutch, the edgeportions of the ring r being turned obliquely upward, in order to guidelubricating medium thrown against the ring outwardly on both sides, outof the reach of the parts to be pro# tected. The contact rings may, inthis casealso be arranged outside the reach of the lubricating mediumlthrown off from the l said bushand hub being' provided with outwardlyinclined guiding surfaces` for the lubricant.

3. In electrofmagnetic friction clutches:

a shaft; afrunning bush; and a hub thereon,

the inner end of said bush and hub extendsurfaces and the two frictionsurfaces of the clutch, and each having outwardly inclined I'guidingsurfaces lfor the lubricant.

4. In electromagnetic friction clutches-z a shaft; a hub thereon; andlubricant guide rings provided with spurting grooves, on

said hub.

' 5. In electro-magnetic friction clutches: a shaft; a running bush; ahub thereon; and lubricant guide rings provided with spurting grooves,on said running bush `and v hub.

In testimony whereof I have hereunto set my hand 1n presence of twosubscribing witnesses.

'HEINRICII AST.

Witnesses I .loser .Rnnnrscm ALvEsro' S. HOGUE.

"ing beyond the planes ofthe two attracting

